Bond paper photocopying machine

ABSTRACT

A xerographic photocopying machine with provisions for holding a stack of cut sheets of bond copy paper and a supply roll of bond copy paper therein, electrical switch means for selectively activating feeding means for feeding sheets from the stack or feeding and cutting means for feeding sheets to be cut from the end of the paper from the roll, a paper guide to receive copy paper sheets from one direction from the stack and from the other direction from the roll, the guide terminating in a common delivery throat for sheets from either source and including sheet advancing rollers along the guide, and a leading edge sensor for pre-positioning the sheet from either source for subsequent advancement coordinate with the operation of the image forming and transfer mechanism. The paper roll is mounted in convenient position alongside of the copying and stack feeding mechanism for ready roll replacement and threading of the new roll. The invention may take the form of an attachment for holding a roll of bond paper and for feeding paper from the roll into a machine otherwise designed for feeding only sheets of bond paper from a stack in a tray.

United States Patent [1 1 Cavallaro et al.

[ Nov. 25, 1975 BOND PAPER PHOTOCOPYING MACHINE [75] Inventors: Angelo C. Cavallaro, Jacksonville;

Jon F. Crehor'e, Mandarin, both of Fla.

[73] Assignee: Cavalier Products, Inc.,

Jacksonville, Fla.

Primary Examiner-John M. Horan Altorney, Agent, or Firm-George H. Baldwin; Arthur G. Yeager [57] ABSTRACT A xerographic photocopying machine with provisions for holding a stack of cut sheets of bond copy paper and a supply roll of bond copy paper therein, electrical switch means for selectively activating feeding means for feeding sheets from the stack or feeding and cutting means for feeding sheets to be cut from the end of the paper from the roll, a paper guide to receive copy paper sheets from one direction from the stack and from the other direction from the roll, the guide terminating in a common delivery throat for sheets from either source and including sheet advancing rollers along the guide, and a leading edge sensor for pre-positioning the sheet from either source for subsequent advancement coordinate with the operation of the image forming and transfer mechanism. The paper roll is mounted in convenient position alongside of the copying and stack feeding mechanism for ready roll replacement andthreading of the new roll.

The invention may take the formof an attachment for holding a roll of bond paper and for feeding paper from the roll into a machine otherwise designed for feeding only sheets of bond paper from a stack in a trav.

7 Claims, 9 Drawing Figures US. Patent N0v.25, 1975 Sheet20f5 3,922,082

. mud-m US. Patent Nov. 25, 1975 Sheet 3 of5 m QW sgaa krlrllliilllllllllllt I US. Patent Nov.25, 1975 Sheet40f5 3,922,082

L mdfi r- L US. Patent Nov. 25, 1975 Sheet50f5 3,922,082

BOND PAPER PHOTOCOPYING MACHINE The present invention relates to a photocopying machine for reproducing a document or the like, particularly by a xerographic process, on copy paper. Such machines have been known wherein bond copy paper is fed from a stack of precut sheets into contact with a master element carrying toner for transfer to the copy sheet, with subsequent fixing to fuse the toner on the sheet and thus to provide a permanent copy of the original. The machine described in Service Manual, Royal Bond Copier, Royal Typewriter Company, Copier Products, February 1972 8-1, copyright I972 Royal Typewriter Company Division of Litton Industries, printed in USA. and obtainable at Technical Publications Department, I50 New Park Avenue, Hartford, Conn., 06106, is such a machine, and the present disclosure relates to an attachment to and minor modifications to such machine to incorporate therewith the selectable facility of roll feed of bond copy paper to the image processing arrangements of such machine.

There are known similar xerographic copying machines arranged to feed bond copy sheets out from a roll, as opposed to feeding sheets from a stack in a tray, and such machines have the advantage of permitting the severing of sheets of different lengths to accord with the size of the document to be copied and less copy paper costs, among other advantages.

It is desired from time-to-time to copy certain types of material onto printed letterhead stationary or the like and this requires feed from a stack in a tray, while other types of material are desirably copied onto unprinted sheets of selectable lengths, providable with roll feed more simply and economically than with separately selectable multiple paper trays in the machine.

It is an object of this invention to provide a bond paper copier machine capable of operation in two modes, in one of which bond paper is fed from a stack in a tray and in the other of which bond paper is fed from a roll and severed into any of two or more selected sheet lengths.

It is a further object to provide a simple and foolproof electrical switching arrangement for selectively activating or enabling either the stacked copy sheet feeding system or the roll feeding system in an automatic pho- 1 tocopying machine.

A specific object of the invention is to provide a simple roll bond copy paper feeding and sheet severing attachment for a known tray bond copy paper feeding I photocopying machine, which requires minimal modification of the pre-existing machine, provides for ready attachment of the attachment to, and ready integration thereof into, the machine, which will not interfere with .the stack feeding arrangements of the machine, and

which permits convenient replacement of paper rolls and easy initial threading of new replacement rolls of paper into the feeding mechanism.

It has been known, for example in US. Pat. No. 3,514,204, to provide a photocopying machine containing a stack of precut sheets of photosensitive copy paper and a roll of uncut photosensitive copy paper, and the machine including a manually controlled cam arranged mechanically to adjust a complicated mechanical linkage system between one condition, in which a sheet is fed from the stack and a second condition in which paper is fed from the roll. In such machine, the document to be copied is fed along a path and two document sensors are required along the path 2 to start the paper from the roll at one position of the document and to start a paper sheet from the stack at a different position of the document in order to compensate for the different lengths of the paths of copy paper from the roll and from the stack.

The roll of paper is mounted directly above the paper tray and both generally underlie the optical scanning system under the top of the cabinet. It is necessary to remove and replace the roll of paper longitudinally of its horizontal axis.

There are various disadvantages to such prior art arrangements.

According to the present invention, the copy paper tray is not only conveniently loadable by pulling it out through the front cabinet doors, as is well known in commercial prior art machines, but the paper roll is conveniently loadable by raising a hinged top panel to expose the cabinet interior in which the roll is mounted, and to expose the paper feed rollers and paper guide portions into which the leading edge of the paper from the roll is to be threaded by hand.

A simple manually operated electrical switch selects bond paper feed from the roll to be severed into anyone of two or more length sheetes or from the stack of precut sheets in the tray. The arrangement is protected against malfunction if the selector switch is moved during a cycle.

Other and further objects and advantages of the invention will become apparent from the following description of a preferred embodiment thereof taken in connection with the accompanying drawings, in which:

FIG. 1 is a top plan view of a photocopying machine in accord with the invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a front view of an enlarged scale of a portion of the machine partially broken away and in section taken generally along line 33 of FIG. 1;

FIG. 4 is a sectional detail view of a portion of the machine taken along the line 44 of FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is an end view taken at the left hand end of the machine with the cover removed;

FIG. 7 is a detail view showing the knife mechanism in relation to associated parts of the machine;

FIG. 8 is a sectional detail view on a further enlarged scale taken along line 8-8 of FIG. 5 and further including a representation of paper from the roll being fed through the knife, roll paper guide and roll paper feed rollers; and

FIG. 9 is a schematic circuit diagram of the novel portions of the control circuit according to the invention, as coordinated with control circuits of a pre-existing tray feed bond copier machine.

The invention may be readily-applied in the form of an attachment to the above referenced pre-existing Royal Bond Copier machine, by relocating the paper delivery fan and motor from the left hand end of the machine to a position to the rear of the attachment simply to make room for the attachment, by removing the outer left hand cover wall of the machine, by attaching to the frame of the machine the front and back support plates of the attachment so that these plates extend outwardly from the left hand end of the machine, by providing an interruption of an intermediate portion of the upwardly extending copy paper guide to provide an entrance slot thereinto from the back side of the guide so that paper fed toward the right from the direction of .the roll, which is mounted between the support plates,

from the paper tray may also enter and pass through the guide, by providing a selector switch to select be-.

tween roll and tray feed, the selector switch preferrably having two or more roll feed positions for selecting between two or more predetermined lengths of sheets to be severed from the roll, and by making several electrical connections to the attachment from the existing circuits of the copier machine.

Turning now to FIGS. 1 and 2 of the drawings, the machine 1 is seen to comprise a main cabinet or cover 2 for housing the operative components, provided with front access doors 3, and further to include an auxiliary hinged cover section 4 mounted on hinges 5, and indicated in open position by broken lines at 4', forming, when closed, a paper roll chamber. In that at least top panel 5 is upwardly swingable, ready access to the paper roll is provided. The main cabinet is provided with a cover flap or panel 6 covering the exposure glass on which the document is placed for copying, a rest 7 against which the cover panel rests when raised, and a copy delivery tray 8 into which completed copies are deposited by the machine.

The machine is provided with indicator lights 9 for warning when it is time to change the electrostatic master elements, to reload the paper tray, and for indicating completion of warm-up time for the mechanism. Print switch button 10 is is located coaxially within a rotatable multiple copy dial 11 on control deck 12, as are pilot light 13, a light-to-dark exposure control 14, and'a copy counter 15. According to the invention, a mode and paper length selector switch 16 is also provided on the deck 12 for selecting paper feed from the tray or, for example, 11 or 14 inch paper sheets to be cut from the roll. 7

Except for the selector switch 16 and the cover section 4 and the parts contained therein, and internal modifications as later described, the machine generally to the right of cover section 4 is substantially in accord with the aforementioned Royal Bond Copier.

FIG. 3 shows generally the mechanical elements designed as an attachment to such prior art bond paper copier and generally provided within cover section 4. A pair of upright parallel support plates, of which rear plate 17is seen, are attached to main machine end frame 18 and these plates supportingly journal a shaft -19 in open-top bearings at each end, such as bearing 20 attached to plate 17, the bearings being attached inwardly of the plates. The readily removable shaft 19 carries a replaceable roll 21 of bond copy paper. The roll is maintained in alignment, that is, against axial movement, and a desired drag against unrolling is applied, by means of a drag plate 22 pivotally mounted on axis 23 to the support plates, and the drag plate rests upon the top of the roll. The plate 22 is provided with downturned edge flanges, such as flange 24, which cage the outer turns of the roll therebetween and prevent the roll from moving along'shaft 19. As paper is unrolled from the roll, as seen at 25, the roll becomes progressively smaller and plate 22 approaches its broken line position 22 adjacent roll core member 25. The core member 25 is shorter than the width of the roll paper to provide finger room for grasping the roll for manual removal and replacement thereof. Plate 22 carries an arm 26 which extends rearwardly of the machine through an arcuate slot 27 in support plate 17, and a switch 28 is mounted on the rear face of plate 17 in position to be closed by contact of arm 26 therewith when arm 26 has moved along slot 27 downwardly with plate 22 until the plate reaches its broken line position 22 representing a nearly exhausted-roll. Switch 28 may be connected to operate, when actuated by arm 26, through known means not otherwise shown herein, a roll empty indicator light such as shown at 9 if desired. By raising cover section 4, the old roll may be removed as shaft 19 is lifted out of its bearings 20. Plate 22 is swung upwardly out of the way during roll replacement, or during toner replenishment.

ln the initial threading of paper 25 from the roll, the leading edge is brought over a guide plate 29 and introduced between rotatable roll paper feed rollers 30 and 31 and continued over cutter bar 32 and under rotatable knife 33. Roller 30 is arranged to be power driven such as by a drive chain from an electric motor not shown, through an electric clutch 107 (seen in FIGS. 5 and 9) which are well known in the art. The drive chain may be typically an extension of the drive for the tray paper delivery drive of the aforesaid Royal Bond Copier. When driven, roller 30, in cooperation with idler roller 31, advances paper 25 through and beyond knife elements 32, 33. Rollers 30, 31 may be manually rotated while the machine is not being power operated to assist in threading the paper from the roll into its proper path, and after a length of paper has been thus threaded, the knife may be manually operated to sever the first several inches to leave a clean leading edge at the knife assembly. Rollers 30 and 31 are mounted on respective shafts journalled in bearings in the support plates'and knife 33 is similarly rotatably journalled in the plates, while cutter bar 32 is fixed to the support plates.

Extending beyond and downwardly from knife assembly 32, 33 is a paper guide 34 underlying the paper and which, as the paper is fed from the roll, directs the paper into transport or delivery rollers 35, 36, the guide being apertured as shown at 37 to permit the several segments or idler roller 35 toproject above the surface of guide 34 into cooperative relation with complementary segments of driven roller 36.

The paper guide continues into an upwardly curved portion 38 toward paper delivery rollers 39, 40. Two

switches 41 and 42 are disposed along guide portion 38 beyond rollers 35, 36 but in advance of rollers 39, 40 and are provided with respective sensitive actuating feelers 43 and 44 for opening the respective switch upon contact by the leading edge of the paper from the roll. Feeler 43 is so positioned that at the moment of knife operation, following by a fraction of a second the contact of the paper edge therewith, a sheet precisely eleven inches, for example, will be severed off at cutter bar 32, while feeler 44 will be three inches further along. One or the other of switches 41 and 42 is selectably connected in circuit by manual switch 16 whereby knife 33 is caused to sever an eleven or fourteen inch sheet from the roll upon contact of its leading edge with the feeler of the respective switch. Actuation of the selected switch 41 or 42 by the paper edge serves to operate knife 33 and, at the same time, to open the clutch through which roller 30 is driven. Rollers 35, 36 and rollers 39, 40, however, continue to operate until the leading edge of the now severed sheet reaches the actuating feeler 45 of switch 46, which then operates to cause disengagement of the respective clutches through which paper delivery rollers 36 and 40 are driven.

A knife interlock switch 74 having a feeler 75 is disposed back along the guide for actuation by the paper leading edge before the edge reaches feeler 43. Paper from the roll must have closed, and must be maintaining switch 74 closed, in order for knife 33 to operate as hereinafter further described. The feeler 75 of switch 74 is preferably located along the guide 34 between cutter 32 and rollers 35, 36.

An upper paper guide section 47 is preferably provided spaced above portion 38 of the lower or outer guide 34 to restrain any tendency of the paper from the roll to rise and to insure that the leading edge will engage and not jump the feelers 43 and 44 and to form a throat 48 adjacently below rollers 39 and 40 through which throat the leading edge is directed accurately into these delivery rollers thereby to minimize any tendency of the paper to bunch or misfeed at this part of its travel.

A curved upper paper guide portion 49 is disposed opposite guide portion 38 and is arranged to receive and guide paper sheets fed in a'direction from right to left, as seen in FIGS. 3 and 4, from the stack of copy paper in a tray in a curved path upwardly into rollers 39, 40.

Generally upwardly directed paper guide plates 50 and 51 are disposed to receive between their respective outwardly flared lower end portions 52 and 53 the leading edge of a paper sheet being fed upwardly along guide 49 from the tray of the leading edge of a new severed eleven or fourteen inch sheet from the roll of paper issuing from throat 48. Guides 50 and 51 are apertured at 54 and 55 to permit the respective segments of rollers 39 and 40 to extend therethrough and nip the paper sheet which has entered between the lower end portions of the guides.

The upper end portions 56 and 57 of the respective guides 50 and 51 are cruved toward the right and form a delivery throat for delivering the copy paper sheet toward and into contact with the master element.

Copy paper guide plates 34, 38, 47, 49, 50 and 51 may be mounted by means of angle tabs, such as tab 58, to the side plates, such as plate 17, or to other fixed frame portions of the machine. Tab 59 is shown as so mounting guide 50, as well as guide 51.

A duct 86 is provided under cover 4 and readily ac- .cessible when the cover is raised for adding toner to the toner dispenser.

FIG. 4 shows elements in accord with the prior art as exemplified by the aforesaid Royal Bond Copier, and ifurther shows certain of the modifications thereto in laccord with the invention, specifically the rearrangement of copy paper guide means which permits the introduction of paper sheets fed from left to right from the roll 21 into the intermediate portion of the copy paper guide means of the prior art machine. Such intermediate portion may be considered to extend from lower end portions 52 and 53 to the paper delivery upon end portions 56 and 57 of guide elements 50, 51. Paper delivery rollers 39, 40 and switch feeler 45 are seen to be located along this intermediate portion.

More particularly, HO. 4 shows an exposure glass or window 60, normally covered by cover flap 6, an optical scanning head 61 with its traversing mechanism 62, a master element assembly 63, a toner dispenser 64 (the toner loading duct for dispensing 64 being omitted for clarity) for storing and dispensing toner to a developer 65, which applies toner onto the surface of the previously exposed master element sheet in the 6 charged image pattern as the master element is moved past the developer by powered drum 66 and idler drum 67.

The drums of the assembly 63 carry a pair of spaced continuous belts entrained thereon, as indicated at 68, to which replaceable electrostatic master element sheets 69 and 70 are removably attached. Assembly 63 is so arranged as to be movable forwardly by the operator when doors 4 are opened to permit ready replacement of the master elements.

A transfer keeper bar plate 71 is pivotally mounted and disposed adjcently below the belts and, thus, adjacent to the path of an exposed master element upon which toner has been deposited. A sheet of copy paper being delivered from delivery end 56, 57 of the paper guide will pass in the direction of arrows 72 over bar 71 and under the advancing master element and will, because of the electrostatic charge on the element, be attracted into contact therewith. Closely beyond bar 71 is a corona unit 73 for so charging the copy paper as to cause the paper to attract the toner to itself and thus to transfer the image from the master element to the paper.

The paper remains in engagement and travels with the master element until the element passes a separator roll 76, which is located above the lower flight of the belts and master elements and which deflects them downwardly so that beyond the separator roll the belts and master elements, which extend generally inclinably downwardly from drum 66 to roll 76, extend therefrom generally inclinedly upwardly toward idler drum 67. Oppositely below roll 76 is a vacuum paper separating assembly 77 including a perforated multipart belt 78 entrained over a drive roll 79 and suitable idler rolls 80. The unit 77 is disposed below the paper which is in contact with the master element and is pivotally mounted on the axis of roller 79 to rock up into contact with the paper under the influence of suction applied from a suitable source through duct 82 into a suction box 83 of the separator assembly 77.

The suction applied to the paper through the belt perforations holds the paper firmly to the moving belt, and the paper is thus peeled away from the master element by the unit 77 and is advanced by the moving conveyor belt onto a paper guide 84. The multipart conveyor belt 78 comprises a plurality of spaced perforate belt elements which move together around the rolls 79, 80, while guide 84 comprises fingers 85 extending between the belt elements to disengage the paper from the belt 78. It will be noted that box 83 terminates short of guide fingers 85 so that suction is not holding the paper to the belt at the point where the paper is being lifted off by the fingers.

The paper sheet passes along guide 84 to a conveyor belt which transport it to a further paper guide 91 disposed under a toner-fixing heater 92 and finally, with the image fixed thereon, the paper is moved along into delivery tray 8 by a rotating delivery roll 93.

The master element assembly 63 will be understood to include a first master element sheet 69 and a second master element sheet 70 connected to and carried by continuous belts 68 entrained around drums 66 and 67. Upon operation of the Print" button 10, optical head 61 moves from its FIG. 4 position toward the right, and, while so moving, scans the document on glass 60 and produces an electrostatic image on master element 69 during a period in which that element remains motionless under the influence of a brake (not shown) in the position shown in FIG. 4. During the period of the forward scan, rollers are being operated to feed a sheet of cop'yjpaper from the roll or from the tray and transport the sheet into the intermediate portion of the paper guide and between delivery rollers 39 and 40 up to feeler 45. The drive of roller 40 is interrupted by switch 46 as the paper leading edge meets feeler 45. As head 61 completes its scan, and as it starts to return to its FIG. 4 position, paper delivery rollers 36 and 40 are again driven and drive of drum 6 is initiated to cause element 69 to move around drum 66, past the toner dispenser 64, and past the toner developer unit 65 from which toner is brushed onto the master, and then into aligned contact with the copy paper sheet being delivered through delivery end 56, 57 of the paper guide and across bar 71. The movement of master element 69 is timed by a cycle timer to coincide with delivery of the paper sheet by roller 40, with the assistance of roller 36 if the sheet is one severed from the roll 21, so that the leading edge of the sheet meets the end of the scanned portion of element 69 and the movement of the element and feeding of the sheet continue at identical speeds so that the sheet aligns with and progressively covers the portion of the element carrying the image of the document.

The document glass may be provided with a documentlocating mark 95 adjacent the left hand end of the window. The optical scanning head 61 imposes an electrostatic image of the document, as it moves from left to right, on the stationary master element 69 with the image of the edge of the document positioned at mark 95 appearing along a predetermined line transversely across the master element as indicated at 96, and the leading edge of the copy paper sheet meets this master element at this line when the master element has been moved through the initial portion of its image transfer cycle. The master element remains stationary during the forward scanning by the head, being held stationary by a magnetic brake omitted from FIG. 4 for the sake of clarity.

Following a complete cycle of the machine, the master elements 69 and 70 will be stationary in the positions shown in FIG. 4. Element 70 is shown in the position which it assumes following its use for transferring a document image. At this time, element 70 may have some residue of toner on its surface and may still carry some electrostatic charge. As drum 66 moves element 69 following the formation of the electrostatic image thereon, that is, after a forward scan of the optics head is completed and while the head is being transported back to starting position, element 70 is moved with belts 68 around drum 67- to take the place of element Y69 and to be ready for the next document scan. Unit 97, which may be either a neon glow lamp or corona unit, is provided adjacent the path followed by element 70 on its way to drum 67, unit 97 being operative to discharge any residual charge on the element, and a brush 98 is provided adjacent drum 67 to brush any residual 'toner from the surface of the element 70 as it passes around the drum, whereby the element is discharged and clean when it reaches its upper position under the optics head ready for the next scan.

Tray assembly 100 is disposed generally to the right of paper guide 49 and below separating assembly 77 and is provided with a picker or feed roll 101 driven by and along guide 49 upwardly between flared lower end portions 52 and 53 of guide plates 50 and 51 to paper delivery rollers 39 and 40, and by these rollers to be further transported until the leading edge of the sheet meets feeler 45, whereupon the advancing of the sheet is interrupted.

The tray assembly 100 includes slide mountings 106 which permit the assembly to be manually drawn forwardly through open doors 4 for reloading with a stack of precut copy paper sheets.

Further details of the interior of the auxiliary cabinet and of the paper guide near the adjacent end 18 of the main cabinet frame are illustrated in FIGS. 5 and 6. The elements are identified by the same reference numerals as previously described and the foregoing description with respect thereto is applicable throughout the drawings.

Feed rollers 30, 31, 35 and 36 comprise sectionalized or segmented roller sections, such as sections 30' and 30", which project through slots in the paper guide plates, such as slot 29' in guide plate 29, each section of each roller of a pair having correspondence with a respective section of the other roller of the pair so that the paper is nipped between the corresponding sections of the rollers. The paper delivery rollers 39 and 40 disposed at the intermediate portion of paper guide plates 50, 51 are similarly sectionalized with roller section 30' projecting through aperture 54 in plate 50 and, in the absence of paper therebetween, being engaged with roller section 40.

The driven rollers 30, 36 and 40 are provided with electrically controlled clutches 107, 108 and 109 connected for driving a motor (not shown) through a suitable drive chain 110, such drive arrangements being well known in the prior art.

Knife 33 is actuated by supplying electric current to a solenoid 112 when the leading edge of the paper from the roll meets feeler 43 or 44 as selected by switch 16. The solenoid is mounted to front frame plate 113 of the auxiliary cabinet and its armature 114 is connected to arm 115 fixed to the knife member, as seen in FIGS. 5 7. Upon actuation, the arm 115 is moved by the solenoid from its solid line position in FIG. 7 to its broken line position 115' thereby to rotate the knife. The knife returns to open position upon deenergization of the solenoid by gravity or, if desired, a known return spring may be provided.

As best seen in FIG. 8, paper 25 from the roll of paper extends between feed rollers 30, 31 and across fixed cutter bar 32. From its relaxed position with its cutting edge at 117 as indicated by a broken line, the knife is rotated thirty or forty degrees in a counter clockwise direction upon actuation of the solenoid moving the edge to its position shown at 117' and causa motor represented at 102 by means of which the topw I most sheet 103 is fed from a stack 104 of precutsheets into the receiving end portion 105 of paper guide 49 ing the knife edge to sever a sheet represented at 118 from the advancing end of the paper 25 being fed from the roll. Upon contact of the leading edge of the paper with the selected feeler 43 or 44 as previously described, the knife is actuated and the drive of roller 30 is simultaneously interrupted under the control of the respective switch 41 or 42.

A cycle is initiated by pressing print button- 10.

In accord with the prior art, as exemplified in said Royal Bond copier, assuming that selector switch 16 is in sheet position, the print button, through suitable relays, initiates a scan by the optical head 61 and energizes motor to rotate paper feed roller 101 momentarily in reverse direction to free the top sheet and then in forward direction to feed the freed sheet 103 along guide 49 to and between delivery rollers 39, 40. In the meantime the clutch of roller 40 is energized to drive the roller until the leading edge of the paper sheet contacts feeler 45 of the paper stop switch 46 which operates to denergize the clutch for roller 40 and stop the paper in position for delivery thereafter. Motor 100, after feeding a sheet from the tray up to rollers 39, 40 remains deenergized until the next cycle is initiated.

A cycle timer is started at the end of the foward scan of the optics head which then starts the drive for master drum 66 and restarts paper delivery roller 40 so that the loading edge of the paper sheet meets the leading edge of the scanned portion of the master element 69 above keeper bar plate 71.

The copy paper and master element continue along vin contact across corona unit 73 to the separator assembly 77. The developer unit 65 operates to provide toner to the electrostatically charged areas of the master as it rounds drum 66 on its way to meet the copy paper sheet, and corona unit 73 causes transfer of the toner to the copy paper. 7

The print button switch further applies power to a 'brake which holds drum 66 stationary throughout the forward scan of the optics head. Before the forward scan is completed, a sheet of copy paper will have reached feeler 45. At the end of the forward scan, this brake is released by a suitable switch actuated by the moving head, and the cycle timer starts, and the head drive is reversed to return the head to its original ready position.

FIG. 9 shows the schematic diagram of the control circuit for the roll paper feed sections of the machine as connected to portions of the control circuits of a prior art bond paper tray feed machine as typified by the :aforesaid Royal Bond Copier.

The main power source is represented by terminals 120 and a cycle is initiated by closing print switch 10. Selector switch 16 comprises three ganged three-position blades 121, 122 and 123 which are shown in their positions corresponding to selection of sheet feed from the tray. The switch may be manually operated into a position to select a feed from the roll of eleven inch sheets, and in this position blades 121, 122 and 123 are in contact with switch contacts 125, 126 and 128, re- .spectively. In its third position, with the blades in Contact with contacts 127, 129 and 130 respectively, the machine is so set that fourteen inch sheets will be ;severed from the roll and fed to the guide means. i With switch 16 set for tray feed, when print button iswitch is depressed voltage is supplied through blade r123 and contact 131 to relay coil 132 causing the coil :toclose contacts 133 to establish a holding or bootstrap Ecircuit maintaining the coil energized, and to open contacts 134. Once the cycle is started for tray feed, moving switch 16 into a roll feed position has no effect since coil 132 remains energized until, after the end of the feeding part of the cycle, the optics head has moved into contact with a pawl 137 under which ratchet 136 was engaged upon depression of button 10 and under which it is thereafter retained pending release. Engagement of the pawl by the optics head at the end of its forward scan causes the release of ratchet 136 and opening of switch 10 by spring 138. Power from terminals 120 is supplied to circuits of the machine through conductors 139, 140 and 141 to power the tray feed motor 101 and clutch 102, the optics head, magnetic brake 151, paper delivery roller 10 clutch 109, and the other elements as shown in FIG. 4, and as incorporated in the prior art Royal Bond Copier.

The blade 122 of the switch 16 is seen to complete a circuit through contact 133 and through normally closed relay contacts 153 between conductors 163 and 164. These conductors are in circuit with a relay, (not shown) which initiates operation of the tray feed motor and clutch, and which, once triggered to do so, continue the feeding operation in timed sequence until a sheet from the tray meets feeler 45 of switch 46 and thereby interrupts the supply of power to clutch 109 for the paper delivery roller 40. Clutch 108 for roll paper delivery or transport roller 36 is connected in parallel with clutch 109 whereby roller 36 is driven whenever roller 40 is driven.

Positioning of switch 16 to select eleven inch or fourteen inch sheets from the paper roll disengages blade 123 from the circuit in relay coil 132, whereby contacts 134 remain closed and voltage is now applied, from switch 10, when closed, through blade 123 and contact 128 or and thence through relay contacts 134 to relay coil 155 causing contacts 153 to open and contacts 156 to close. Closing of contacts 156 establishes a holding circuit for the relay in parallel with the circuit through contacts 134 and switch blade 123 to contact 128 or 130, whereby the coil remains excited regardless of subsequent movement of switch 16. Even if, after the start of a cycle, switch 16 were returned to the tray feed position resulting in energization of relay coil 132, the cycle would continue in the selected roll feed mode, with contacts 153 remaining open. Contacts 153 are, as shown, in circuit with the means for initiating operation of the tray feed motor 102 and, when open, prevent operation.

Thus relay coils 132 and 155, respectively, are excited in accord with the selection of the mode of operation between tray feed and roll feed, and when excited, each of these relays establishes a holding circuit for maintaining its respective coil energized, and in so doing, in the case of coil 132, disconnects coil 155 against subsequent excitation and, in the case of coil 155, interrupts the connection to the circuit for the tray feed mechanism so that that mechanism cannot thereafter be actuated, thereby preventing subsequent movement of switch 16 from affecting the originally selected feeding operation.

With selection of roll feed, with switch 16 set with blade 121 in contact with contact 125, blade 122 in contact with open contact 126 and blade 123 in contact with contact 128, upon closure of print switch 10 to start the cycle, ac. power is supplied via contacts 134, as described, to coil 155 and to input terminal 142 of bridge rectifier 143, the other terminal of which is connected to the ac. return conductor 166, thus to provide a d.c. voltage on output terminals 145, 146. This dc. voltage is applied from terminal 146 through normally closed paper roll interlock switch 28 to one terminal of relay coil 167 and from rectifier terminal through normally closed paper edge sensing switch 41, switch contact 125 and blade 121 to the other terminal of coil 167, whereby coil 167 acts to open relay contacts 168 and to close contacts 169.

Should the roll of paper be empty, or substantially so, switch 28 will be open and no operation of the roll paper feed roller 30 will occur.

As previously noted, the master element transport is braked during the period from the initiation of a print cycle until the completion of the forward scan of the age across coil 151 to electromagnetic clutch 107 thereby to cause roller to feed paper from the roll.

Knife solenoid 112 fires upon the application of dc. voltage thereto. One terminal of the solenoid is directly connected to rectifier terminal 145, while the other is connected to terminal 146 through relay switch contacts 168 and knife interlock switch 74 in series. At the start of a cycle as rectifier 143 first provides a dc. output voltage and before relay contacts 168 would have time to open, the knife would, or might, fire in the absence of open switch 74. Switch 74 is a roll paper feed knife interlock which remains open until roll paper has been fed along the guide for some distance after the relay contacts 168 and l69'have picked up, that is, until the leading edge of the roll paper has met feeler 75 located along guide 34 and has thus caused switch 74 to close.

Knife solenoid 112 is fired, if eleven inch roll paper is selected,-upon the leading edge of the paper, having heretofore closed switch 74, reaching feeler 43, whereupon switch 41 opens, breaks the circuit to coil 167 and causes closing of knife actuating contacts 168 and simultaneous opening of contacts 169. Such opening results in deenergization of roll paper feed clutch 107 and stopping of feed roller 30.

If eleven inch roll paper has been selected by switch 16, opening of switch 41 causes relay coil 167 to be deenergized and the knife to fire. If, during the very short period of time thereafter that is required for the paper edge to travel the three inches from feeler 43 to feeler 44 of switch 42, switch 16 were changed to the fourteen inch position, relay coil 167 might have timeto again open contacts 168 and to permit the knife to recover, and at the same time to reenergize feed roller clutch 107, and then upon subsequent opening of switch 42, the knife would again fire, perhaps severing an inch or two of paper which might have reached the knife, but the cycle would continue with the eleven inch sheet being transported and delivered in normal manner. Changing the switch from the eleven to the fourteen inch setting before the paper edge has'reached switch feeler 43 will be effective to cause a fourteen inch sheet to be severed with no other effect, while this change of switch 16 being made after the leading edge of a severed eleven inch sheet has reached feeler 44 is ineffective and the eleven inch'sheet which was severed upon actuation of switch 41 is delivered to the master element in the normal manner.

If the switch 16 is changed from fourteen inch to e ectrically energized to apply the brake during the forward scanning period, and contacts 169 apply the volteleven inch position before the paper edge has reached 43', an eleven inch sheet will be severed, if the switch is so changed while the sheet leading edge is between feelers 43 and 44, a sheet of a length between eleven and fourteen inches will be severed, and in either case the sheet'so severed will progress in the normal manner. Of course, if both switches 41 and 42 are open at the time of change, or at any time that switch 74 is open, i.e. with no paper at feeler 75, the knife cannot fire upon any change of switch 16.

The description herein has been based on the assumption that switch feeler 43 is positioned a fraction of an inch less than eleven inches along the paper guide from cutter bar 30 so that by the time the knife operates after switch 41 opens an eleven inch sheet will be severed, and on the assumption that feeler 44 is simi larly position but further along the paper guide to effec- I tuate severing of a fourteen inch sheet.'lt will be apparent that such sheet sizes are exemplary only, and that the switch feelers may beso located as to cause any other desired sheet lengths to be severed, and, if de-' sired, other selectable sheet length switches may be added at other distances along the guide from bar 30 to permit selection of three or more different sheet lengths to be severed from the roll.

Since contacts 128 and are interconnected, the only circuit change when switch 16 is moved from the eleven inch sheet length position to the fourteen inch length is tosubstitute switch 42 for switch 41 in the circuit, blade 121 being now in contact with contact 127. It will be noted that contacts 128 and 130 for blade 123 are interconnected, while blade 122, in positionfor roll feed, is engaged with isolated contacts 126 or 129.

As heretofore explained, paper delivery rollers 40 and 36 are driven during the first part of the cycle by energizing clutch coils 108 and 109, which are connected in parallel. Such energization is originally supplied from conductors and 171 through switch 46. Conductors 170 and 171 remain energized from the start of the cycle at least until the copy paper has been fed out through delivery ends 56, 57 of the paper guide into contact with the toner-carrying master element.

As the leading edge of the paper sheet, whether feed from the roll or the tray, meets switch feeler 45, the

clutch coils 108 and 109 are deenergized by opening of I that many modifications and changes may be made by those skilled in the art without departing from the spirit of the invention. It is intended, therefore, by the appended claims to cover all such modifications and changes as fall within the true spirit and scope of the invention. 1

' What is claimed as new and what it is desired to secure by Letters Patent of the United States is:

1. In a xerographic bond paper photocopying machine, the combination of a pair of spaced, upwardly extending paper guide members for guiding a sheet of copy paper therebetween and terminating upwardly in paper delivery ends, a horizontal document window disposed above said paper delivery ends, said guide members having flared apart lower end portions, a horizontal paper tray adapted to hold a stack of precut bond copy paper laterally spaced in a predetermined direction from one side of said members, means including a paper guide extending from said tray and comprising an upwardly curved end portion terminating between said flared lower end portions for feeding a sheet of paper from a stack in said tray in a direction'opposite to said predetermined direction toward and upwardly between said guide members, a bond copy paper roll holder adapted to hold a roll of paper laterally spaced in a direction opposite to said predetermined direction fromthe opposite side of said members,.means disposed adjacent saidholder and between said holder 13 and said paper guide members for drawing paper from such roll and severing from the paper from such'roll a sheet of predetermined length from the advancing end of such paper, paper guide means for such severed sheet disposed between said paper drawing and severmined direction away from said paper drawing and sev ermg means and toward said guide members andincluding a final upwardly curved guide portion terminating between said flared lower end portions for feeding such severed sheet toward and upwardly between said guide members, a paper sheet delivery roller disposed above said lower end portions and below said paper deliveryends for nippingly engaging a sheet so fed be tween said members from said paper guide means'or from said paper guide, first actuating means for actuat ing said drawing and severing means and said advancing means, second actuating means for actuating said sheet feeding means, and means for selectively operating one and the other of said first and second actuating means. I i i 2. In a xerographic copy machine comprising a paper tray forreceiving a stack of precut bond copy paper sheets of uniform size, a master electrostatic image element, means to charge said element from an original document and to apply toner thereto, said element beingadapted to receivea single sheet of said copy paper in registering contact therewith while such sheet receives toner corresponding to the electrostatic image on said master element, a paper sheet guide having a receiving end and a delivery end for receiving a sheet of paper from said stack at its receiving end and directing such sheet to its delivery end, said delivery end being disposed adjacent said element, said guide having an intermediate portion between its said ends, a sheet feeder engageable with one sheet at a time seriatim of said stack operable to advance such, one sheet from said .stack into said receiving end to said intermediate portionof said guide, conveying means at said intermediate portion engageable with the sheet introduced thereinto by said feeder movable ina direction to convey the sheet along said guide through said intermediate portion to and projectingly beyond said delivery iend, means for moving said toner-carrying master element,into registering contact with a sheet issuing'from saiddelivery. end, means to transfer toner from said ele- :ment to said sheet while in such registering' contact, land sequencing switch means for actuating said conveying means, said master element moving means, and lsaid charging means in predetermined relation and including a sensing switch for sensing the arrival of the ;leading edgeof a sheet at a predetermined location between said conveying means and said delivery end, said sensing switch being operative to stop said conveying means upon such arrival, said sequencing switch means including means for subsequently re-starting said conveying means in coordination with operation of said master element moving means thereby to register said leading edge at a predetermined part of the toner-carrying master element, the improvement comprising, 'means for mounting a roll of paper, roll paper guide means having a receiving end portion adjacentsaid roll and a delivery end adjacent said intermediate portion, transport means comprising a first element adapted and positioned to engage the end of the paper from said roll and operative to advance paper from said roll into'said 14 receiving end portion of said roll paper guide means and said transport means further including a second element spaced along said roll paper guide means from said first element toward said delivery end for advancing paper into said intermediate portion of said guide means and into engagement with saidconveying means, a knife disposed along said roll paper guide means between said receiving end portion and said second element, paper edge sensor means disposed at a predetermined location along said roll paper guide means between said second element and said delivery end of said roll paper guide means responsive to arrival of the leading edge of the paper from said roll to actuate said knife thereby to sever a sheet of predetermined length from said roll of paper, manually operable mode selecting means for energizing said first element of said transport means and concurrently disabling said sheet feeder and selectively operable to disable said first element and to energize said sheet feeder thereby to select between feeding of sheets from said stack and feeding and severing of sheets from said roll, said second element of said transport means being connected to said conveying means for concurrent starting and stopping operation therewith.

3. In combination in a xerographic bond paper copying machine of the type comprising a main cabinet having a first end, a second end, a front, and a top with a horizontal document window therein, saidfront being provided with an opening and a closure therefor, an electrostatic image element and an optical document scanner below said window housed in said main cabinet, a copy paper tray disposed below said image element and scanner during operation of said machine and displaceable forwardly through said opening for loading a stack of precut sheets of bond copy paper thereinto, means for feeding sheetsone at a time from said trayin a first generally horizontal direction toward said first end, a paper guide having a lower end for receiving said sheets from said feeding means and having an intermediate portion extending upwardly adjacent said first end of said cabinet, said guide curving upwardly from its said lower end into such intermediate portion, said intermediate portion terminating in an upper end portion of said guide directed toward said second end of said cabinet for directing sheets from said intermedi ate portion in a generally horizontal second direction opposite to said first direction toward said image element, and a sheet delivery roller disposed at said intermediate portion, means for supplying sheets of paper from an auxiliary source into said intermediate portion comprising an auxiliary cabinet alongside and extending from said first end, said auxiliary cabinet housingan auxiliary roll paper holder spaced from said firstend for 'replaceably holding a roll of bond copy paper, said auxiliary cabinet having a hinge-mounted panel, swingable from a closed into an open positionto expose the interior of said auxiliary cabinet to permit loading of said holder, roll paper guide means extending from said holder toward said paper guide and terminating inan upwardly curving guide portion at said intermediate portion, means for advancing paper from said roll along said guide means, knife means disposed along said roll paper guide means for severing a sheet of paper from such roll, said intermediate portion being interrupted below said roller to form an entrance slot thereinto for receiving a sheet severed from such roll from said roll paper guide means into said intermediate portion, and means for selectively actuating one and the other of said roll paper advancing means and said sheet feeding means.

4. The combination according to claim 3 wherein paper sensing switch means are provided along said roll paper guide means a predetermined distance toward said termination of said guide means from said knife means operative to actuate said knife upon Contact of the leading edge of the paper advancing along said guide means thereby to sever into a sheet a length thereof corresponding to said predetermined distance.

5. In combination in a xerographic bond paper copying machine of the type comprising a main cabinet having a first end, a second end, a front, and a top with a horizontal document window therein, said front being provided with an opening and a closure therefor, an electrostatic image element and an optical document scanner below said window housed in said main cabinet, a copy paper tray disposed below said image element and scanner during operating of said machine and displaceable forwardly through said opening for loading a stack of precut sheets of bond copy paper thereinto, means for feeding sheets one at a time from said tray in a first generally horizontal direction toward said first end, a first paper guide having a lower end for receiving said sheets from said feeding means and having an intermediate portion extending upwardly adjacent said first end of said cabinet, said guide curving upwardly from its said lower end into such intermediate portion, said intermediate portion terminating in an upper end portion of said guide directed toward said second end of said cabinet for directing sheets from said intermediate portion in a generally horizontal second direction opposite to said first direction toward said image element, and a sheet delivery roller disposed at said intermediate portion, means for supplying sheets of paper from an auxiliary source into said intermediate portion comprising an auxiliary cabinet alongside and extending from said first end, said auxiliary cabinet housing an auxiliary paper holder spaced from said first end for holding an auxiliary supply of bond copy paper, said auxiliary cabinet having a hingemounted panel swingable from a closed into an open position to expose the interior of said auxiliary cabinet to permit loading of said holder, auxiliary paper guide means extending from said holder toward said first paper guide and terminating in an upwardly curving portion at said intermediate portion, means for advancing a sheet of paper from said auxiliary holder in said second direction along said auxiliary guide means, said first paper guide being interrupted below said roller and above said lower end to form an entrance slot for receiving into said intermediate portion such sheet so advanced along said auxiliary guide means, and means for selectively actuating one and the other of said paper advancing means and said sheet feeding means.

6. In a xerographic copy machine comprising a paper tray for receiving a stack of precut bond copy paper sheets of uniform size, an elongated generally horizontal image element assembly having a paper sheet receiving end and being disposed above said paper tray, said assembly comprising a master electrostatic image element, means to charge said element corresponding to indicia on an original document and to apply toner thereto, said paper tray being generally horizontally disposed and having a sheet delivery end oriented in the same direction as said sheet receiving end, said element being adapted to receive a single sheet of said copy paper in registering contact therewith while such sheet receives toner corresponding to the electrostatic image on said master element, a paper sheet guide having a receiving end confronting said delivery end of said tray for receiving a sheet of paper fed from said stack in said direction and said guide having a delivery end confronting said receiving end of said assembly, said guide being operative to direct a sheet received from said stack in said direction at its said receiving end to its said delivery end and in said opposite direction to said receiving end of said assembly, said guide having an upright intermediate portion between its said ends, a sheet feeder engageable with one sheet at a time seriatim of said stack operable to advance such one sheet in said direction from said stack into said receiving end and into said intermediate portion of said guide, conveyance means at said intermediate portion engageable with the sheet introduced thereinto by said feeder movable in a direction to convey the sheet upwardly along said guide through said intermediate portion to and projectingly beyond said delivery end in said opposite direction to said receiving end of said assembly, means for moving in said opposite direction said toner-carrying master element and a sheet so issuing from said delivery end in such registering contact, means to transfer toner from said element to said sheet while in such registering contact, and sequencing switch means for actuating said sheet feeder, said conveyance means, said master element moving means, and said charging means in predetermined relation and including a sensing switch for sensing the arrival of the leading edge of a sheet at a predetermined location along said intermediate portion between said conveyance means and said delivery end, said sensing switch being operative to stop said conveyancing means upon such arrival, said sequencing switch means including means for subsequently re-starting said conveyancing means in coordination with operation of said master element moving means thereby to register said leading edge at a predetermined part of the toner-carrying master element, the improvement comprising, an auxiliary sheet paper sup ply arrangement comprising an auxiliary paper holder adapted to hold an auxiliary supply of paper and disposed spacedly in said direction from said guide and adapted to supply sheets of paper in said opposite direction toward said guide, said arrangement including auxiliary paper guide means extending from said holder to said paper guide for directing paper from said auxiliary supply in said opposite direction and having an upwardly curved delivery end portion meeting said intermediate portion of said paper guide below said conveyancing means, said intermediate portion of said paper guide being interrupted to admit a sheet of paper from said upwardly curved end portion into said intermediate portion, transport means comprising a first element adapted and positioned to engage the paper to be next fed from said auxiliary holder and operative to advance such paper from said auxiliary holder into said receiving end portion of said auxiliary paper guide means and said transport means further including a second element spaced along said auxiliary paper guide means from said first element toward said delivery end portion for advancing paper into said intermediate portion of said paper sheet guide and into engagement with said conveyance means, paper edge sensor means disposed at a predetermined location along said auxiliary paper guide means between said second element and said delivery end of said auxiliary paper guide means responsive to arrival of the leading edge of the paper fed from said auxiliary holder to interrupt operation of said first element, manually operable mode-selecting switch means for electrically energizing said first element of said transport means and concurrently disabling said sheet feeder and selectively operable to disable said first element and to energize electrically said sheet feeder thereby to select feeding of sheets from said stack and feeding of paper from said auxiliary holder, said second element of said transport means being connected to said conveyancing means for concurrent starting and stopping operation therewith.

7. In combination in xerographic bond paper copying machine of the type comprising a main cabinet having a first end, a second end, a front, and a top with a horizontal document window therein, said front being provided with an opening and a closure therefor, an electrostatic image element and an optical document scanner below said window housed in said main cabinet, a copy paper tray disposed below said image element and scanner during operating of said machine and displaceable forwardly through said opening for loading a stack of precut sheets of bond copy paper thereinto, means for feeding sheets one at a time from said tray in a first generally horizontal direction toward said first end, a first paper guide having a lower end for receiving said sheets from said feeding means and having an intermediate portion extending upwardly adjacent said first end of said cabinet, said guide curving upwardly from its said lower end into such intermediate portion, said 18 intermediate portion terminating in an upper end portion of said guide directed toward said second end of said cabinet for directing sheets from said intermediate portion in a generally horizontal second direction opposite to said first direction toward said image element, and a sheet delivery roller disposed at said intermediate portion, means for supplying sheets of paper from an auxiliary source into said intermediate portion comprising an auxiliary cabinet alongside and extending from said first end, said auxiliary cabinet housing an auxiliary paper holder spaced from said first end for holding an auxiliary supply of bond copy paper, said auxiliary cabinet including panel means movable from a closed position enclosing said holder into an open position to expose the interior of said auxiliary cabinet to permit loading of said holder, auxiliary paper guide means extending from said holder toward said first paper guide and terminating in an upwardly curving portion at said intermediate portion, means for advancing a sheet of paper from said auxiliary holder in said second direction along said auxiliary guide means, said first paper guide being interrupted below said roller and above said lower end to form an entrance slot for receiving into said intermediate portion such sheet so advanced along said auxiliary guide means, and means for selectively actuating one and the other of said paper advancing means and said sheet feeding means. 

1. In a xerographic bond paper photocopying machine, the combination of a pair of spaced, upwardly extending paper guide members for guiding a sheet of copy paper therebetween and terminating upwardly in paper delivery ends, a horizontal document window disposed above said paper delivery ends, said guide members having flared apart lower end portions, a horizontal paper tray adapted to hold a stack of precut bond copy paper laterally spaced in a predetermined direction from one side of said members, means including a paper guide extending from said tray and comprising an upwardly curved end portion terminating between said flared lower end portions for feeding a sheet of paper from a stack in said tray in a direction opposite to said predetermined direction toward and upwardly between said guide members, a bond copy paper roll holder adapted to hold a roll of paper laterally spaced in a direction opposite to said predetermined direction from the opposite side of said members, means dispoSed adjacent said holder and between said holder and said paper guide members for drawing paper from such roll and severing from the paper from such roll a sheet of predetermined length from the advancing end of such paper, paper guide means for such severed sheet disposed between said paper drawing and severing means and said guide members and means for advancing such sheet into and along said guide means, said paper guide means extending in said predetermined direction away from said paper drawing and severing means and toward said guide members and including a final upwardly curved guide portion terminating between said flared lower end portions for feeding such severed sheet toward and upwardly between said guide members, a paper sheet delivery roller disposed above said lower end portions and below said paper delivery ends for nippingly engaging a sheet so fed between said members from said paper guide means or from said paper guide, first actuating means for actuating said drawing and severing means and said advancing means, second actuating means for actuating said sheet feeding means, and means for selectively operating one and the other of said first and second actuating means.
 2. In a xerographic copy machine comprising a paper tray for receiving a stack of precut bond copy paper sheets of uniform size, a master electrostatic image element, means to charge said element from an original document and to apply toner thereto, said element being adapted to receive a single sheet of said copy paper in registering contact therewith while such sheet receives toner corresponding to the electrostatic image on said master element, a paper sheet guide having a receiving end and a delivery end for receiving a sheet of paper from said stack at its receiving end and directing such sheet to its delivery end, said delivery end being disposed adjacent said element, said guide having an intermediate portion between its said ends, a sheet feeder engageable with one sheet at a time seriatim of said stack operable to advance such one sheet from said stack into said receiving end to said intermediate portion of said guide, conveying means at said intermediate portion engageable with the sheet introduced thereinto by said feeder movable in a direction to convey the sheet along said guide through said intermediate portion to and projectingly beyond said delivery end, means for moving said toner-carrying master element into registering contact with a sheet issuing from said delivery end, means to transfer toner from said element to said sheet while in such registering contact, and sequencing switch means for actuating said conveying means, said master element moving means, and said charging means in predetermined relation and including a sensing switch for sensing the arrival of the leading edge of a sheet at a predetermined location between said conveying means and said delivery end, said sensing switch being operative to stop said conveying means upon such arrival, said sequencing switch means including means for subsequently re-starting said conveying means in coordination with operation of said master element moving means thereby to register said leading edge at a predetermined part of the toner-carrying master element, the improvement comprising, means for mounting a roll of paper, roll paper guide means having a receiving end portion adjacent said roll and a delivery end adjacent said intermediate portion, transport means comprising a first element adapted and positioned to engage the end of the paper from said roll and operative to advance paper from said roll into said receiving end portion of said roll paper guide means and said transport means further including a second element spaced along said roll paper guide means from said first element toward said delivery end for advancing paper into said intermediate portion of said guide means and into engagement with said conveying means, a knife disposed along said roll paper guide means between said receiving end portion and said seCond element, paper edge sensor means disposed at a predetermined location along said roll paper guide means between said second element and said delivery end of said roll paper guide means responsive to arrival of the leading edge of the paper from said roll to actuate said knife thereby to sever a sheet of predetermined length from said roll of paper, manually operable mode selecting means for energizing said first element of said transport means and concurrently disabling said sheet feeder and selectively operable to disable said first element and to energize said sheet feeder thereby to select between feeding of sheets from said stack and feeding and severing of sheets from said roll, said second element of said transport means being connected to said conveying means for concurrent starting and stopping operation therewith.
 3. In combination in a xerographic bond paper copying machine of the type comprising a main cabinet having a first end, a second end, a front, and a top with a horizontal document window therein, said front being provided with an opening and a closure therefor, an electrostatic image element and an optical document scanner below said window housed in said main cabinet, a copy paper tray disposed below said image element and scanner during operation of said machine and displaceable forwardly through said opening for loading a stack of precut sheets of bond copy paper thereinto, means for feeding sheets one at a time from said tray in a first generally horizontal direction toward said first end, a paper guide having a lower end for receiving said sheets from said feeding means and having an intermediate portion extending upwardly adjacent said first end of said cabinet, said guide curving upwardly from its said lower end into such intermediate portion, said intermediate portion terminating in an upper end portion of said guide directed toward said second end of said cabinet for directing sheets from said intermediate portion in a generally horizontal second direction opposite to said first direction toward said image element, and a sheet delivery roller disposed at said intermediate portion, means for supplying sheets of paper from an auxiliary source into said intermediate portion comprising an auxiliary cabinet alongside and extending from said first end, said auxiliary cabinet housing an auxiliary roll paper holder spaced from said first end for replaceably holding a roll of bond copy paper, said auxiliary cabinet having a hinge-mounted panel, swingable from a closed into an open position to expose the interior of said auxiliary cabinet to permit loading of said holder, roll paper guide means extending from said holder toward said paper guide and terminating in an upwardly curving guide portion at said intermediate portion, means for advancing paper from said roll along said guide means, knife means disposed along said roll paper guide means for severing a sheet of paper from such roll, said intermediate portion being interrupted below said roller to form an entrance slot thereinto for receiving a sheet severed from such roll from said roll paper guide means into said intermediate portion, and means for selectively actuating one and the other of said roll paper advancing means and said sheet feeding means.
 4. The combination according to claim 3 wherein paper sensing switch means are provided along said roll paper guide means a predetermined distance toward said termination of said guide means from said knife means operative to actuate said knife upon contact of the leading edge of the paper advancing along said guide means thereby to sever into a sheet a length thereof corresponding to said predetermined distance.
 5. In combination in a xerographic bond paper copying machine of the type comprising a main cabinet having a first end, a second end, a front, and a top with a horizontal document window therein, said front being provided with an opening and a closure therefor, an electrostatic image element and an optical document scanner Below said window housed in said main cabinet, a copy paper tray disposed below said image element and scanner during operating of said machine and displaceable forwardly through said opening for loading a stack of precut sheets of bond copy paper thereinto, means for feeding sheets one at a time from said tray in a first generally horizontal direction toward said first end, a first paper guide having a lower end for receiving said sheets from said feeding means and having an intermediate portion extending upwardly adjacent said first end of said cabinet, said guide curving upwardly from its said lower end into such intermediate portion, said intermediate portion terminating in an upper end portion of said guide directed toward said second end of said cabinet for directing sheets from said intermediate portion in a generally horizontal second direction opposite to said first direction toward said image element, and a sheet delivery roller disposed at said intermediate portion, means for supplying sheets of paper from an auxiliary source into said intermediate portion comprising an auxiliary cabinet alongside and extending from said first end, said auxiliary cabinet housing an auxiliary paper holder spaced from said first end for holding an auxiliary supply of bond copy paper, said auxiliary cabinet having a hinge-mounted panel swingable from a closed into an open position to expose the interior of said auxiliary cabinet to permit loading of said holder, auxiliary paper guide means extending from said holder toward said first paper guide and terminating in an upwardly curving portion at said intermediate portion, means for advancing a sheet of paper from said auxiliary holder in said second direction along said auxiliary guide means, said first paper guide being interrupted below said roller and above said lower end to form an entrance slot for receiving into said intermediate portion such sheet so advanced along said auxiliary guide means, and means for selectively actuating one and the other of said paper advancing means and said sheet feeding means.
 6. In a xerographic copy machine comprising a paper tray for receiving a stack of precut bond copy paper sheets of uniform size, an elongated generally horizontal image element assembly having a paper sheet receiving end and being disposed above said paper tray, said assembly comprising a master electrostatic image element, means to charge said element corresponding to indicia on an original document and to apply toner thereto, said paper tray being generally horizontally disposed and having a sheet delivery end oriented in the same direction as said sheet receiving end, said element being adapted to receive a single sheet of said copy paper in registering contact therewith while such sheet receives toner corresponding to the electrostatic image on said master element, a paper sheet guide having a receiving end confronting said delivery end of said tray for receiving a sheet of paper fed from said stack in said direction and said guide having a delivery end confronting said receiving end of said assembly, said guide being operative to direct a sheet received from said stack in said direction at its said receiving end to its said delivery end and in said opposite direction to said receiving end of said assembly, said guide having an upright intermediate portion between its said ends, a sheet feeder engageable with one sheet at a time seriatim of said stack operable to advance such one sheet in said direction from said stack into said receiving end and into said intermediate portion of said guide, conveyance means at said intermediate portion engageable with the sheet introduced thereinto by said feeder movable in a direction to convey the sheet upwardly along said guide through said intermediate portion to and projectingly beyond said delivery end in said opposite direction to said receiving end of said assembly, means for moving in said opposite direction said toner-carrying master element and a sheet so issuing from said delivery End in such registering contact, means to transfer toner from said element to said sheet while in such registering contact, and sequencing switch means for actuating said sheet feeder, said conveyance means, said master element moving means, and said charging means in predetermined relation and including a sensing switch for sensing the arrival of the leading edge of a sheet at a predetermined location along said intermediate portion between said conveyance means and said delivery end, said sensing switch being operative to stop said conveyancing means upon such arrival, said sequencing switch means including means for subsequently re-starting said conveyancing means in coordination with operation of said master element moving means thereby to register said leading edge at a predetermined part of the toner-carrying master element, the improvement comprising, an auxiliary sheet paper supply arrangement comprising an auxiliary paper holder adapted to hold an auxiliary supply of paper and disposed spacedly in said direction from said guide and adapted to supply sheets of paper in said opposite direction toward said guide, said arrangement including auxiliary paper guide means extending from said holder to said paper guide for directing paper from said auxiliary supply in said opposite direction and having an upwardly curved delivery end portion meeting said intermediate portion of said paper guide below said conveyancing means, said intermediate portion of said paper guide being interrupted to admit a sheet of paper from said upwardly curved end portion into said intermediate portion, transport means comprising a first element adapted and positioned to engage the paper to be next fed from said auxiliary holder and operative to advance such paper from said auxiliary holder into said receiving end portion of said auxiliary paper guide means and said transport means further including a second element spaced along said auxiliary paper guide means from said first element toward said delivery end portion for advancing paper into said intermediate portion of said paper sheet guide and into engagement with said conveyance means, paper edge sensor means disposed at a predetermined location along said auxiliary paper guide means between said second element and said delivery end of said auxiliary paper guide means responsive to arrival of the leading edge of the paper fed from said auxiliary holder to interrupt operation of said first element, manually operable mode-selecting switch means for electrically energizing said first element of said transport means and concurrently disabling said sheet feeder and selectively operable to disable said first element and to energize electrically said sheet feeder thereby to select feeding of sheets from said stack and feeding of paper from said auxiliary holder, said second element of said transport means being connected to said conveyancing means for concurrent starting and stopping operation therewith.
 7. In combination in xerographic bond paper copying machine of the type comprising a main cabinet having a first end, a second end, a front, and a top with a horizontal document window therein, said front being provided with an opening and a closure therefor, an electrostatic image element and an optical document scanner below said window housed in said main cabinet, a copy paper tray disposed below said image element and scanner during operating of said machine and displaceable forwardly through said opening for loading a stack of precut sheets of bond copy paper thereinto, means for feeding sheets one at a time from said tray in a first generally horizontal direction toward said first end, a first paper guide having a lower end for receiving said sheets from said feeding means and having an intermediate portion extending upwardly adjacent said first end of said cabinet, said guide curving upwardly from its said lower end into such intermediate portion, said intermediate portion terminating in an upper end portion of said guide directed tOward said second end of said cabinet for directing sheets from said intermediate portion in a generally horizontal second direction opposite to said first direction toward said image element, and a sheet delivery roller disposed at said intermediate portion, means for supplying sheets of paper from an auxiliary source into said intermediate portion comprising an auxiliary cabinet alongside and extending from said first end, said auxiliary cabinet housing an auxiliary paper holder spaced from said first end for holding an auxiliary supply of bond copy paper, said auxiliary cabinet including panel means movable from a closed position enclosing said holder into an open position to expose the interior of said auxiliary cabinet to permit loading of said holder, auxiliary paper guide means extending from said holder toward said first paper guide and terminating in an upwardly curving portion at said intermediate portion, means for advancing a sheet of paper from said auxiliary holder in said second direction along said auxiliary guide means, said first paper guide being interrupted below said roller and above said lower end to form an entrance slot for receiving into said intermediate portion such sheet so advanced along said auxiliary guide means, and means for selectively actuating one and the other of said paper advancing means and said sheet feeding means. 